Question

What type of stoichiometric defect is shown by:
A.$\text{ZnS}$
B.$\text{AgBr}$

Answer 1

Frenkel defect

It is a kind of defect in crystalline solids in which atoms are displaced from their lattice position to interstitial site creating vacancy at the lattice point. It usually occurs in ionic solid with large difference in size of ions.

Defect arising upon heating solid

$\text{ZnS}$ shows Frenkel defect due to a large difference in size of $Z{n}^{2+}$ ion and $S^{2-}$ion.

Final Answer: Frenkel defect

Frenkel defect

Frenkel defect : It is a kind of defect in crystalline solids in which atoms are displaced from their lattice position to
interstitial site creating vacancy at the lattice point. It usually occurs in ionic solid with large difference in size of ions.

Schottky defect

This defect occurs when oppositely charged ions leave their lattice site creating vacancies in such a way that electrical neutrality of crystal is maintained. It is generally seen in highly
ionic compounds where difference in size of cation and anion is small.

Defect shown by $\text{AgBr}$

$\text{AgBr}$ shows Frenkel defect and Schotty defect

Final Answer:

$\text{AgBr}$ shows Frenkel defect and Schotty defect.